/*
 * Copyright [2010] [GP Software]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ContextUtil.java | Created on April 27, 2010
 */
package org.gp.gpetl.util;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Utility for retrieving bean instances
 *
 * @author Paul Augustine C. Mendoza
 * @since 1.0
 */
public class ContextUtil {

    /**
     * The application context
     */
    private static BeanFactory context;


    /**
     * Restricted constructor
     */
    private ContextUtil() {
        super();
    }

    /**
     * Initializes the Spring context
     */
    private static void initializeContext() {
        context = (BeanFactory) new ClassPathXmlApplicationContext(
                new String[]{"resources.xml", "daos.xml", "services.xml"});
    }

    /**
     * Gets the bean instance from the application context
     *
     * @param beanName the bean name
     * @return the bean instance
     */
    public static Object getBean(String beanName) {
        Object bean;
        if (context == null) {
            initializeContext();
        }
        return context.getBean(beanName);
    }
}
